[Presence of biotypes of "Streptococcus mutans group" in the mouth of Belgrade children].

Strains of "Streptococcus mutans group" were tested in order to determine their belonging to the biotype according to the scheme suggested by Shklair. Biochemical testing of the strains was performed by API 20 Strep system. All the strains tested in this experiment showed biochemical activity characteristic for Streptococcus mutans, Biotype I, Genetic group I, and serological groups (c, e, f). The results of this research are in accordance with the results of similar works performed in various geographical areas.